Berlin 2005 – scientific programme
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O: Oberflächenphysik
O 12: Nanostrukturen I
O 12.5: Talk
Friday, March 4, 2005, 16:45–17:00, TU EB202
Single-molecule chemical field-effect transistors with nanometer-sized gates: demonstration and tests — •Frank Jäckel1, Zhaohui Wang2, Mark D. Watson2,3, Klaus Müllen2, and Jürgen P. Rabe1 — 1Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin, Germany — 2Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany — 3University of Kentucky, Department of Chemistry, Lexington KY 40506-0055, USA
We present a prototypical three-terminal single-molecule device in which the current through a hybrid molecular diode, made from a single molecule in the junction of a scanning tunneling microscope, is modified by the presence of oriented organic charge transfer complexes covalently attached to the molecule in the gap. The set-up represents the first single-molecule transistor with nanometer-sized gates [Phys. Rev. Lett. 92 (2004) 188303]. The observed change in the current-voltage characteristics is explained with an interface dipole originating from the charge transfer complexes. We present tests of this model with respect to the orientation of the dipoles.